<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        span {
            font-size: 20px;
            line-height: 1;
            /* w h 无效 */
            width: 50px;
            height: 50px;
            color: white;
            background-color: green;
            /* 垂直方向 m p 无效 */
            margin-top: 10px;
            padding-top: 20px;
            margin-right: 100px;
            padding-left: 50px;
            /* display: inline-block; */
        }
    </style>
</head>

<body>
    <span>
        ccc
        <div>
            ddd
        </div>
    </span>
</body>

</html>